THE EXO BUILDING POINT VILLAGE CONSTRUCTION METHODOLOGY PLAN PROJECT NO. C th SEPTEMBER 2015

Transcription

1 THE EXO BUILDING POINT VILLAGE CONSTRUCTION METHODOLOGY PLAN PROJECT NO. C th SEPTEMBER 2015

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3 THE EXO BUILDING POINT VILLAGE

4 NOTICE This document has been produced by O Connor Sutton Cronin & Associates for its client Grant Thornton. It may not be used for any purpose other than that specified by any other person without the written permission of the authors. Job No: C705 Document Ref.: L:\Linda's Documents\2015\09-September\Reports\C705 (CW).doc Rev. Status Authors Checked Reviewed Authorised Issue Date Final D. Kierans M. McGrath M. McGrath M. McGrath 15/09/2015 NOTE: This report is a preliminary plan written by OCSC multidisciplinary design engineers and will be subject to detailed development by the main contractor on appointment. It sets out likely and anticipated construction methodology and phasing which will be developed by a main contractor prior to commencement of construction on site.

5 THE EXO BUILDING POINT VILLAGE CONSTRUCTION METHODOLOGY PLAN PROJECT NO. C th SEPTEMBER 2015 INDEX PAGE 1.0 DESCRIPTION OF THE PROJECT OUTLINE DEVELOPMENT PROGRAMME INDICATIVE SITE SET UP SITE MONITORING, SECURITY & MANAGEMENT METHODOLOGY FOR REMOVAL OF BASEMENT STRUCTURES BASEMENT & SUPERSTRUCTURE CONSTRUCTION PROPOSED CONSTRUCTION HAUL ROUTES CONSTRUCTION STAGE COMMUNITY LIAISON 20

6 THE EXO BUILDING POINT VILLAGE CONSTRUCTION METHODOLOGY PLAN 15 th SEPTEMBER DESCRIPTION OF THE PROJECT INTRODUCTION O Connor Sutton Cronin & Associates (OCSC) Multidisciplinary Consulting Engineers have been appointed by Grant Thornton to prepare a (CMP) for a proposed development at North Docklands, Dublin. The subject site is bounded by North Wall Quay, East Wall Road, Mayor Street Upper and the 3 Arena. The overall site will eventually accommodate 18,621 m 2 of commercial office space with basement level car parking and associated infrastructure, as well as a retail glass box to the north in the Point Square. The site is located within the area of the North Lotts & Grand Canal Dock Planning Scheme and is shown in that context in Figure 1. The Exo Building Planning Scheme Boundary Figure 1: Planning Scheme & Exo Building Extents Project No. C705 1

7 The building will be supported by three reinforced concrete cores above a single level basement. There is existing basement access from Sherriff Street Upper. Alterations are to be made to the existing Watch Tower basement Level -1 to convert this space into a basement for the Glass Box and 47 car parking spaces to service the Exo building Office block. The Exo Building is shown against an aerial photographic background in Figure 2 with the site boundary outlined. Point Village District Centre 3 Arena East Wall Road Site Location North Wall Quay Figure 2: Exo Building Location 2.0 OUTLINE DEVELOPMENT PROGRAMME The preliminary programme is included in the following pages of this report. KEY ACTIVITIES & TIMELINES: The overall design, planning and construction programme will take approximately 2.0 years commencing in 2016 and ending in 2018; Project No. C705 2

8 East Wall Road Ma yor Str eet Up per No rth Wa ll Qu ay O Connor Sutton Cronin & Associates The first planning application for development will be lodged in September See the below with activity time estimates. Activity Weeks Demolition 8 Sheet piling 10 Piling 15 Excavation 20 Concreting 60 Steelwork 30 Cladding 25 Mechanical 50 Electrical 50 Lifts 6 Fit Out INDICATIVE SITE SETUP INTRODUCTION The proposed site set up is shown in Figure 4. Figure 3: Site Set Up Project No. C705 3

9 SITE OFFICES & COMPOUND Site offices will be provided with in the point square area, position to be agreed with Point Village Management and 3 Arena Management. Appropriate segregation will be employed on site to separate pedestrians form heavy equipment. Fenced off pedestrian walkways will be provided close to the site offices. HOARDING EXTENT The entire site will require hoarding with overhead protection for pedestrians throughout due to the expected crowds congregating in the area during events at the 3 Arena. COORDINATION WITH 3 ARENA Contractor will liaise with the 3 arena for all events in advance and in particular events where an audience may attend evening events during site hours. In such incidences the contractor will assist and cooperate with site security and Garda to manage the crowd safety issues. A detailed operation and emergency procedures report between the Exo Building and surrounding area will be prepared between 3 Arena management, Point Village Management and the contractor. It will be drafted to facilitate ongoing operations at the 3Arena and wider Point Village area to insure sufficient space for an evacuation of the 3 Arena and access for emergency services. Project No. C705 4

10 Figure 4: Typical 3 Arena Crowd CONSTRUCTION PERSONNEL NUMBERS Based on a construction contract value of 60 million over a 100 week construction period, it is estimated that 40,000 man weeks of onsite labour will be required for the project. Based on industry standard figures it is likely that an average of 200 construction personnel will be on site on a daily basis. However it is likely that this figure may approach 300 during periods of peak activity. CONSTRUCTION VEHICLE NUMBERS Based again on a construction contract value of 60 million over a 100 week construction period, it is estimated that maximum construction vehicle numbers will be of the order of 60 movements per day. LOGISTICS PLANNING With the limited site access available and the location of the site within a busy City, the proximity of the site to the River Liffey along with the presence of the 3 Arena, and District Centre could cause environmental and construction challenges. This document puts forward some outline measures to deal with these issues however it is expected that more detailed measures will be conditioned through the planning process and that a more detailed Material Logistics Plan (MLP) will be prepared by the Project No. C705 5

11 competent contractor appointed to the works (see Section 9 later). A major part of construction planning for the development will be the development of the MLP. This plan will stipulate that prior notice be given of major deliveries including materials, plant and equipment times. The Main Contractor will be required to prepare and adhere to a Site Environmental Policy Plan and all subcontractors will be required to buy into this document. Unscheduled deliveries will not be allowed access to the site. SITE ACCESS PEDESTRIAN ACCESS Pedestrian access will be strictly controlled via a manned turnstile system. Only Safepass accredited personnel will be permitted on site. Figure 5: Access Turnstiles VEHICULAR ACCESS Vehicular access to the site will be via North Wall Quay only and left only exit via East Wall Road only. This will be strictly managed and controlled see Site Monitoring, Security & Management section following. ON SITE PARKING Minimal on-site provision will be made for car parking by site construction personnel see Mobility Management Plan submitted under separate Project No. C705 6

12 cover. Personnel will be encouraged to use public transport which is widely available in the surrounding area. All vehicular access will be controlled at the gate where all access and egress movements will be recorded. All site personnel and delivery drivers will have to undergo site induction. A Site Safety & Induction Room will be provided as part of the site set up. SITE CRANEAGE It is estimated that three tower cranes will be required on site with a further heavy lifting mobile crane during the construction of the façade truss in order to provide efficient site coverage. The exact number will be dictated by the main contractors programme and the specific construction requirements. Figure 6: Tower Crane 4.0 SITE MONITORING, SECURITY & MANAGEMENT MONITORING NOISE MONITORING Noise monitoring will be carried out in accordance with any DCC planning consent and also in accordance with Safety, Health and Welfare at Work (Construction) Regulations Safety, Health and Welfare at Work Act 2005, BS 6187: Code of Practice for Full & Partial Demolition, BS 5228:2009 Code of Practice for Noise & Vibration Control on Construction & Open Sites, Environmental Protection Agency Act Project No. C705 7

13 Figure 7: Noise Monitoring VIBRATION MONITORING Vibration monitoring will be carried out in accordance with BS , 2009, Code of Practice for Noise & Vibration Control on Construction & Open Sites. AIR QUALITY MONITORING Appropriate Air Quality and Dust monitoring will be carried out on a regular basis in accordance with DCC planning conditions and records will be kept of all such monitoring for review by the Planning Authority. Figure 8: Air Quality Monitoring Station Project No. C705 8

14 PRE COMMENCEMENT CONDITION SURVEYS A Visual Condition Survey (VCS) will be carried out of all surrounding streets and recorded with the City Council prior to any site works commencing. The appointed Main Contractor will have to liaise with DCC Roads & Traffic Department to agree any changes to load restrictions and construction access routes for the site. Measures will be put in place as required to facilitate construction traffic whilst simultaneously protecting the built environment. SITE SECURITY & MANAGEMENT The site will be closely managed on a day to day basis by site management. Security and control will be provided at the main site access to record control all personnel entering and leaving the site and to record and control all materials entering and leaving the site. Appropriate manned security will be maintained at the site access gates in order to secure the site, to control vehicular access and to monitor and record all deliveries and removals operations. Figure 9: Manned Security Gates WHEEL WASHING FACILITIES A properly sized and designed wheel wash will be provided and maintained on site for the full duration of construction. Appropriate water collection and filtering will take place prior to discharge to the public sewer system. Project No. C705 9

15 Gate staff will be trained to inspect vehicles for cleanliness prior to egress to the public road network and any trucks that have been inadequately cleaned will be returned to site. Figure 10: Truck Wheel wash COVERED VEHICLES Cover systems will be used on all vehicles removing spoil from site so as to minimise dust arisings on surrounding streets. Figure 11: Truck Covering System Trucks leaving the site will, as previously noted, pass through a wheel washing system. In addition these trucks will be watered down and covered as shown. This will be carried out in a dedicated wash down zone with dedicated site personnel. Project No. C705 10

16 CONCRETE BREAKING In all cases the most efficient and environmentally sensitive methodologies will be used in the demolition process. Concrete munchers will be used instead of a rock breaker. This is a much quieter piece of equipment and generates significantly less noise Figure 14. Figure 12: Concrete Muncher Where munchers cannot be used i.e. for in-situ reinforced slabs, then multi-head concrete breakers will be used. DUST SUPPRESSION The use of appropriate water based dust suppression systems will greatly reduce the amount of dust and windborne particulates as a result of the demolition process. This system will be closely monitored by site management personnel particularly during extended dry periods and in accordance with site management methods discussed earlier. Figure 13: Dust Suppression System Project No. C705 11

17 5.0 METHODOLOGY FOR REMOVAL OF WATCH TOWER BASEMENT LEVEL -1 INTRODUCTION The site currently has an asphalt finish with a cobbled area in the square. There is also the existing Watch Tower basement. Existing Watch Tower Basement Figure 14: Existing Basement on Site ENABLING WORKS In terms of enabling works the following is proposed: The asphalt top is to be removed; Existing stone in the point square area is to be taken up and stored for se use on the project; Sheet piling for The Exo Building is to be constructed; During excavation the watch tower podium slab is to be demolished with all vertical structure to level -1 removed; Project No. C705 12

18 Neighbouring uses will be protected from construction activities and construction generated noise by the erection of robust 2.4 m high sound attenuation hoardings. ARISINGS A standalone Construction & Demolition Waste Management Plan has been prepared for the site and will be submitted in support of the planning application(s). That document notes that the following materials may arise on site: Reinforced concrete bases: 1602 tonnes. Asphalt: 2012 tonnes. Existing soil berm: 20,926 tonnes. Metals: 112 tonnes. SOIL WASTE MANAGEMENT A site investigation, specified by OCSC was carried by IGSL in July The trial pit and borehole logs from this site investigation have been examined by URS Limited who were the Environmental Consultants on the watch tower project. The results of this site investigation and testing regime will not however be available in advance of this planning application. It is noted that soil generated as part of the construction works will be managed in accordance with a Soil Waste Management Plan to be produced by an environmental management company based on the 2005 site investigation in advance of the construction stage. That report will identify the nature and classification of the soil waste and will detail management procedures to be implemented to ensure appropriate handling and disposal in accordance with Irish and EU legislative requirements. Project No. C705 13

19 MEASURES TO PROTECT GROUNDWATER Specific measures to protect groundwater during the construction works on site will be put in place under the control of the site Environmental Consultant. 6.0 BASEMENT & SUPERSTRUCTURE CONSTRUCTION BASEMENT CONSTRUCTION METHODOLOGY Initial works will include A sheet pile retaining wall prior to excavation. CFA piles the installation of piles. Subject to detailed design, pile diameters will be of the order of 900 mm. All basement concrete works will be designed and constructed as watertight structures in accordance with BS A pour plan will be agreed with the Engineer ahead of casting. This will outline the location of construction joints and the specific detailing of all watertightness installations. Figure 15: Basement Sequence Construction will be by traditional formwork and falsework methods with all temporary works being fully designed by a qualified structural engineer. Formwork and rebar will be handled by mobile and tower craneage. Project No. C705 14

20 Figure 16: Rebar and Water Bar Installation Planning restrictions on working times will be strictly adhered to in the basement construction operation. In this regard it will be important for the Main Contractor to schedule sufficient time to accommodate poor or cold weather limitations on working times. Figure 17: EXO Building Project No. C705 15

21 Figure 18: EXO Building at Ground Floor SUPERSTRUCTURE The entire development comprises of a 73m tall 17 storey office block with an 8 story element to the south end of the block. The office block will be supported off the ground by its 3 structural reinforced concrete cores (as shown above. A two story steel frame structure in the centre of the square with an RC core. Once the basement is constructed the 3 reinforced concrete cores can be built. Temporary supports will be constructed off the basement retaining walls to support the steel exoskeletons construction. The exoskeleton truss will be fabricated off site, lifted into place onsite and bolted together. Onsite welding will be designed out where possible but may be required at times. Once the exoskeleton has been erected the interior steel structure and metal deck floor can be constructed. When the concrete for the metal deck has cured the façade may fitted. Once the building is watertight the first and second stage fit outs can start. HEALTH & SAFETY Health & Safety issues during construction will be a primary concern for the Main Contractor. This will apply in respect of persons working on the site and in respect of passing pedestrians, motorists or other transport Project No. C705 16

22 carriers. In this regard the highest possible care will be taken in providing properly designed scaffolding. Figure 19: Sample Scaffolding Given the location of the site in a live city environment, special care will be taken to provide suitable protection for passing pedestrians Figure 18. The following general principles will apply: Toe boards will be provided; There will be no lifting of materials over live footpaths or roadways; A sloped fan will be provided at second floor level and will move upwards as construction advances; Debris netting will be provided for the full scaffolded perimeter; Fully recorded inspections will be carried out of the scaffolding for the full duration of construction. Figure 20: Pedestrian Protection Project No. C705 17

23 SEQUENCING The Main Contractor will engage with the professional design team to reach early agreement on an acceptable construction sequence. The building will be made watertight as soon as possible so as to allow the fit out of lower floors to progress as scheduled. 7.0 PROPOSED CONSTRUCTION HAUL ROUTES INTRODUCTION As part of the planning process, representatives of the developer have had a number of meetings with the Planning Authority including the Roads & Traffic Department. A number of documents have been produced in relation to Traffic Impact Assessment, Construction & Demolition Waste Management, Mobility Management Planning and this document. All of these have been produced with the aim of minimising the construction and operational phase impacts of the development. Notwithstanding the above it is evident that the construction of the development, in a city centre location, will generate very significant traffic movements including movements of heavy goods vehicles. These vehicles will be involved in bringing deliveries to the site and removing waste and spoil from the site. CONSTRUCTION DELIVERY & HAUL ROUTES It is important that the most appropriate construction routes be identified in order to bring materials to and from the site in the most efficient and environmentally sensitive manner. It is noted that specific haul routes will be agreed and licensed between the Main Contractor and DCC. The site is located on the north side of the city and is approximately 9 kilometres from the M1-M50 junction. It is also located just over 1 kilometre from the Dublin Port Tunnel. Project No. C705 18

24 CONSTRUCTION ROUTE OPTIONS The following options are put forward for discussion: The Green Route: this runs directly from the site to the Dublin Port Tunnel, through the tunnel and then along the old N1 to the M1-M50 junction; The Red Route: this route runs along East Wall Road to the old N1 at North Strand before turning right and running along the old N1 until it joins the green route beyond the Port Tunnel exit; Figure 21: Construction Route Options Project No. C705 19

25 8.0 CONSTRUCTION STAGE COMMUNITY LIAISON INTRODUCTION The appointed Main Contractor will be required to follow best practice Considerate Constructor guidelines. The Considerate Constructor experience in Ireland and the U.K. has been that early positive and proactive engagement with businesses and residents impacted by building works is the best approach. CODE OF CONSIDERATE PRACTICE Considerate Constructors seek to improve the image of the construction industry by striving to promote and achieve best practice under the Code. The Code of Considerate Practice outlines the Scheme's expectations and describes those areas that are considered fundamental for registration with the Scheme. The Code is in five parts and contains a series of bullet points. Each section of the Code contains an aspirational supporting statement and four bullet points which represent the basic expectations of registration with the Scheme. The Code of Considerate Practice applies to all registered sites, companies and suppliers regardless of size, type or location. RESPECT THE COMMUNITY Constructors should give utmost consideration to their impact on neighbours and the public by informing, respecting and showing courtesy to those affected by the work. This shows itself in minimising the impact of deliveries, parking and work on the public highway. It also contributes to and supports the local community and economy. Finally it works to create a positive and enduring impression, and promoting the Code. COMMUNITY LIAISON MANAGER A Community Liaison Officer (CLO) will be appointed by the Main Contractor to lead and manage all community related issues. The CLO will initially host and attend regular community meetings. Following the initial meetings the CLO will compile a list of stakeholders in the area. These stakeholders will be kept informed of progress and planned works on the Project No. C705 20

26 site through the publication and distribution of a Monthly Progress Newsletter. Figure 22: Community Newsletter Follow through is a vital attribute for successful community liaison so it will be a fundamental element of the CLO s job description that they continually engage with the community, follow through on promises and deliver results. UPDATED CONSTRUCTION PROGRAMME An important element of community liaison will be the provision of updates to the community on the construction programme. Figure 23: Updated Programmes Project No. C705 21

27 In this regard each edition of the Community Newsletter will feature an updates to the construction programme along with details of any upcoming Exceptional Activities which may impact on traffic, short term accessibility for businesses or residents or have the potential to be disruptive. It is intended that by implementing a strong community liaison relationship that the environmental impacts of the proposed development on the community can be minimised and the social impacts, by way of local employment or business opportunities may be maximised. CORMAC WOODS CHARTERED ENGINEER ASSOCIATE B.Sc.(Eng), Dip.Struct.Eng., P.Grad.Dip(H&S in Construction) C.Eng., M.I.E.I., M.I.Struct.E., Grad IOSH OCSC MULTIDISCIPLINARY CONSULTING ENGINEERS Project No. C705 22

28 Appendix A OCSC Drainage Drawing

29 Appendix B Attenuation Calculation & Hydrobrake Details

30 Appendix C OCSC East Wall Road Set Down Drawing

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